RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 65 , Issue 9
Showing 1-4 articles out of 4 articles from the selected issue
Article
  • Kaori Matsuoka, Shinnosuke Kusaba, Sougo Nishio, Kiyoshi Hiraoka
    2016 Volume 65 Issue 9 Pages 367-376
    Published: September 15, 2016
    Released: September 15, 2016
    JOURNALS OPEN ACCESS

    We evaluated the effects of pruning on the concentration and total amount of radiocaesium in Japanese chestnut trees (Castanea crenata Sieb. et Zucc. ‘Porotan’) after radionuclide deposition from the nuclear accident at the Fukushima Daiichi Nuclear Power Plant. In March 2013 (2 years after the accident), trees grown in Ibaraki Prefecture were subjected to heavy or conventional pruning, or no pruning as a control. Over the next 2 years, pruning significantly decreased the yield of fruits, but did not significantly affect the concentration of radiocaesium in new organs including fruits. Two years after the treatments, the total amount of radiocaesium in a tree was reduced by 13% by conventional pruning and by 36% by heavy pruning in comparison with that in control. Furthermore, the distribution of radiocaesium in a tree two years after the treatment suggested that, unlike radioactive postasium, radiocaesium in new organs was not derived from the soil through root uptake but was translocated from old branches and trunks which exposed at the time of radionuclide deposition.

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Material (Data)
  • Kazue Tazaki, Keely Brandon, Sachiko Yamamoto, Makoto Sato, Takashi Ha ...
    2016 Volume 65 Issue 9 Pages 383-392
    Published: September 15, 2016
    Released: September 15, 2016
    JOURNALS OPEN ACCESS

    Abundant intracellular and cell wall Strontium sorption has been identified in phytoplankton biomass and Pectinatella magnifica by SEM-EDS and ICP-MS. Both of them thrive in polluted waters of the paddy pond district, where pH 7–8.5 and 20–30°C, C (42.9 wt%), H (5.8 wt%) and N (7.6 wt%) during summer in 2015. The isolates of phytoplankton community and Pectinatella magnifica contain 0.65 mg/L Sr by dry weight, using ICP-MS method. Concentration factors for Rb 1–1.55 mass% and Sr 5–7.5 mass% in the point analyses, using SEM-EDS method, endorsing the role of microorganisms in mediating transfer of metal solutes from the hydrosphere to sediments. We report here the Sr sorption previously unrecognized in phytoplankton biomass and Pectinatella magnifica. Here, we describe the simple preparation of removal strontium from contaminated water in pond associated with phytoplankton biomass and Pectinatella magnifica by use of heated zeolite adsorbent. Strontium adsorptive burn zeolite particles settle done and become clear water for few months.

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Serial Lecture
Neutron Scattering Study on Dynamics of Atomic and Molecular Motions
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